v0.9

[attipaci]

Initial SuperNOVAS implementation:

Bugs fixed:

• sidereal_time bug
• ephem_close bug
• antedating velocities and distances for light travel time in ephemeris()
• bug in ira_equinox() which may return the result for the wrong type of equinox if the the 'equinox' argument was changing from 1 to 0, and back to 1 again with the date being the same.
• accuracy bug in cio_basis(), cio_location(), ecl2equ_vec(), equ2ecl_vec(), geo_posvel(), place(), and sidereal_time(), which could return a cached value for the other accuracy if the other input parameters are the same as a prior call with different accuracy.
• Fix multiple bugs in using cached values in cio_basis() with alternating CIO location reference systems.
• Fix bug in equ2ecl_vec() and ecl2equ_vec() whereby a query with coord_sys = 2 (GCRS) has overwritten the
  cached mean obliquity value for coord_sys = 0 (mean equinox of date). As a result, a subsequent call with
  coord_sys = 0 and the same date as before would return the results GCRS coordinates instead of the
  requested mean equinox of date coordinates.
• wrong use of fmod() in solsys3.c, leading to incorrect calculation of the mean anomaly for date prior to J2000, hence incorrect positions for Sun and Earth.

Additions:

• Makefile for libs (static and shared)
• Converted API docs to doxygen and edited as appropriate.
• Argument checking and improved error handling
• Added structs and functions for more unified / simplified position calculations
• Dynamically configurable solarsystem() and ephemeris_reader implementations.
• Added several new functions

Changes:

• Change method signatures to use enums
• Use const modifiers for non-output pointer arguments
• Allow some output pointers to be NULL if not needed by the caller.
• Streamlined code -- both more readable and also faster in many places / cases.